Matlab

simulink spectrum scope
I'm trying to see the spectrum of a 100Hz sine wave. I'm using a sine wave at 100Hz, Amplitude=1 and sample time = 1/10000. The output of sine wave go to a spectrum scope (dBm, Buffer size = 128*128) The output of sine wave go also to a running RMS block and a dBm conversion block using 1 ohm giving 27 dBm which is... 14 Jul 2010 14:18

A little embarrasing
Hi guys, I kinda forgot how to call t=a function like: function []= moleculenodes(file_name, L, R, z) fid1=fopen(file_name,'wt'); m = 5*L; n = sqrt(.5)*R+.5*L; o = .5*L+(.5-z*.5)*R*sqrt(.5); .... It was something like: moleculenodes(1, 1, 1) but that didn't work. Thanks! Cordially, Mohammad ... 14 Jul 2010 14:18

ttest2 matlab7.8.0 2009a
I am having problems using the ttest2 function in matlab7.8.0 R2009a even when i enter in 2 sets of random data (ie. a=[2;4;5;6;4;3;5], b=[2;4;8;6;5;4;2] then ttest2 (a,b) I get this error. I do not get this error in an earlier version of matlab, with the same data. ?? Error using ==> size Dimension argument mus... 14 Jul 2010 17:37

Question about ldl factorization : can it be "out-of-cored"?
Hello, I am running matlab on Mac OSX 10.6.4. I want to ldl-factorize sparse real symmetric matrices. I am using HSL ma57 package through the ldl matlab function. When I try to factorize matrices that have a size larger than ~40 000 matlab just stops running after a minute or so. My guess is that I run out of memory ... 14 Jul 2010 16:31

Help on FFTSHIFT
Iam finding out correlation between two images using the following command correlation = fftshift(real(ifft2(conj(fft2(double(sub_image_1))).*fft2(double(sub_image_2))))); then finding out the peaks of the correlation field. Why the peaks are always at integral x,y??? Ne knows please help me. With rega... 14 Jul 2010 14:18

Line Type Scaling
Is there any way to scale the dashed/dashed dot lines on plots to make the dashes longer and/or farther apart? ... 14 Jul 2010 14:18

passing MATLAB structures to C/C++
I'm attempting the same: Passing a matlab structure to C, and unwrapping it using all of the built in mxarray functions. I thought the following example on the Mathworks documentation site would be helpful (http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_external/f42645.html), but typing it verbatim, I g... 14 Jul 2010 14:17

Matrix Rotation About Origin
Hi All - I have a matrix that I need to rotate a specified number of degrees about the x,y origin. I have found resources for matrix rotation for 90 degrees but I need a way to do it a user specified amount (say, for example, 5 degrees). Can anyone point me in the right direction? Thanks! matt ... 21 Jul 2010 15:49

solve
Hello, I don't know how to use the solve function. I've read the matlab doc, but I don't know how to solve this problem. I have the following parameters. a =-1; b = 1.5; c = 0; I want to use this equation: A = solve('a*cos(x) - b*sin(x)=c'); This gives: A = (-2)*atan((b - (a^2 + b^2 - c^2)^(1... 14 Jul 2010 22:00

fzero probably easy fix
Hi guys, So usually when I use fzero, I have one variable that I'm trying to solve for. Currently, I still have one variable I want to solve for, but I have other variables I would input myself: f = input('Please enter focal length. [f]: '); h = input('Please enter lens diameter. [h]: '); n = input('Please ente... 14 Jul 2010 14:17